Aethra is Theseus's mortal mother and emotional anchor.
Theseus lives as an outcast with his mother Aethra, and he later returns to bury her after Hyperion murders her.
Hyperion's murder of Aethra intensifies Theseus's personal hatred.
During the attack on Theseus's village, Hyperion murders Aethra while Theseus is forced to watch.
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